IV 889 GENERATOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Virtual Outputs ......................................................................................................................................4 - 110
Analog Outputs.....................................................................................................................................4 - 111
Protection....................................................................................................................................... 4 - 112
Generator Elements............................................................................................................................4 - 113
Percent Differential.............................................................................................................................4 - 114
Overall Percent Differential .............................................................................................................4 - 120
Generator Unbalance (46)................................................................................................................4 - 131
Inadvertent Energization (50/27)..................................................................................................4 - 135
Loss of Excitation (40).........................................................................................................................4 - 137
Third Harmonic Neutral Undervoltage (27TN)........................................................................4 - 143
Third Harmonic Voltage Difference.............................................................................................4 - 146
Offline Overcurrent (50OFL).............................................................................................................4 - 151
Overload Alarm.....................................................................................................................................4 - 154
Current Elements .................................................................................................................................4 - 156
Inverse Time Overcurrent Curves.................................................................................................4 - 156
Phase Time Overcurrent Protection (51P).................................................................................4 - 164
Phase Instantaneous Overcurrent Protection (50P) ............................................................4 - 167
Phase Directional Overcurrent Protection (67P)....................................................................4 - 169
Neutral Time Overcurrent Protection (51N).............................................................................4 - 172
Neutral Instantaneous Overcurrent Protection (50N).........................................................4 - 175
Neutral Directional Overcurrent Protection (67N) ................................................................4 - 178
Ground Time Overcurrent Protection (51G).............................................................................4 - 183
Ground Instantaneous Overcurrent Protection (50G).........................................................4 - 186
Ground Directional Overcurrent Protection (67G) ................................................................4 - 187
Sensitive Ground Time Overcurrent Protection (51SG).......................................................4 - 192
Sensitive Ground Instantaneous Overcurrent Protection (50SG)..................................4 - 195
Sensitive Ground Directional Overcurrent Protection (67SG)..........................................4 - 198
Restricted Ground (Earth) Fault (87G) .........................................................................................4 - 203
Negative Sequence Instantaneous Overcurrent Protection (50_2)..............................4 - 208
Negative Sequence Directional Overcurrent Protection (67_2).....................................4 - 211
Load Encroachment ...........................................................................................................................4 - 215
Voltage Elements .................................................................................................................................4 - 218
Phase Reversal (47) .............................................................................................................................4 - 219
Undervoltage Curves .........................................................................................................................4 - 221
Phase Undervoltage Protection (27P).........................................................................................4 - 222
Auxiliary Undervoltage (27X) ..........................................................................................................4 - 225
Phase Overvoltage Protection (59P)............................................................................................4 - 228
Auxiliary Overvoltage Protection (59X) ......................................................................................4 - 231
Neutral Overvoltage Protection (59N) ........................................................................................4 - 234
Negative Sequence Overvoltage Protection (59_2).............................................................4 - 237
Volts per Hertz (24) ..............................................................................................................................4 - 239
Impedance Elements .........................................................................................................................4 - 245
Out-of-step (78).....................................................................................................................................4 - 245
Power Elements....................................................................................................................................4 - 251
Directional Power (32)........................................................................................................................4 - 251
Reactive Power (40Q) .........................................................................................................................4 - 257
Frequency Elements...........................................................................................................................4 - 260
Underfrequency (81U) .......................................................................................................................4 - 260
Overfrequency (81O) ..........................................................................................................................4 - 263
Frequency Rate of Change (81R)..................................................................................................4 - 266
Monitoring...................................................................................................................................... 4 - 270
Generator ................................................................................................................................................4 - 271
Running Hours.......................................................................................................................................4 - 271
Frequency OOB Accumulation (81A) ..........................................................................................4 - 273
Thermal Overload Protection (49TOL) ........................................................................................4 - 276
Breaker......................................................................................................................................................4 - 282
Trip and Close Circuit Monitoring .................................................................................................4 - 282
Breaker Arcing Current......................................................................................................................4 - 290
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